Reasons and Solutions for Accuracy Decreased Flow Meters

Abstract: The reasons for the decline in the accuracy of the flow meter and the solution information are provided by the excellent flow meter and flow meter production and quotation manufacturers. At present, there are many types of flowmeters, but generally used are positive displacement flowmeters, electromagnetic flowmeters, turbine flowmeters, and vortex flowmeters. The accuracy of the flowmeter is generally determined under the reference conditions at the factory. affect the reference conditions. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the reasons for the decline in the accuracy of flowmeters and solutions. At present, there are many types of flowmeters, but generally used are positive displacement flowmeters, electromagnetic flowmeters, turbine flowmeters, and vortex flowmeters. The accuracy of the flowmeter is generally determined under the reference conditions at the factory. There are many factors that affect the reference condition, such as environmental conditions, power source conditions of electromagnetic flowmeters, and fluid conditions. However, the actual operating conditions of a flow meter are usually different from the reference conditions, so there will be a drop in accuracy during use. Also, the degree to which the accuracy of different meters changes is different. The following is an analysis of the reasons for the decline of the accuracy of different flowmeters and the solutions: 1. The accuracy of the throttling device throttling device generally does not require fluid calibration, and the factory inspection is mostly used.“dry label”method, the basic accuracy can be calculated. The calculation is based on the supply provided by the buyer“Rated value”, The density of the medium can be automatically compensated and displayed intelligently. In this case, the key point is whether the installation location of the instrument meets the requirements of the instrument, such as the length of the straight pipe section. If the requirements are not met, the calculation of the additional error should refer to Instruction manual for the instrument. If the density of the medium is calculated manually, when the actual state of the fluid medium is different from the design state, for general gases, the displayed value of flow should be multiplied by a correction factor, and T, Z, and P are respectively designed under the rated working state. medium temperature, compression coefficient, and medium pressure; t, z, and p are the medium temperature, compression coefficient, and medium pressure under actual working conditions, respectively. Obviously, the temperature and pressure of the fluid change randomly during actual work, and the manual compensation of the ultrasonic flowmeter can only compensate the average value, and the error is significant. The better way is to use an intelligent instrument to automatically compensate. For ideal (or near-ideal) gases, this compensation accuracy is quite high, and the accuracy of displayed mass flow or standard volume flow can reach± 1%. The throttling device has certain requirements for the straight pipe section, and the additional error caused when it cannot be satisfied is specified for the standard throttling device. 2. The additional error caused by the positive displacement flowmeter under the actual working conditions of the positive displacement flowmeter is usually due to the influence of the temperature and pressure of the fluid medium on the volume of the metering cavity. When the material of the cavity is known, it can be calculated The change in volume corrects the reading of the display meter. The viscosity of the actual fluid may also have an effect on the meter reading and should be considered according to the meter's instructions. The length of the straight pipe generally does not affect its accuracy, which is the outstanding advantage of this type of instrument. This type of instrument displays the volume flow of the fluid in the working state, and the user usually needs the volume flow or mass flow under the standard state, and also needs to perform the density compensation of the fluid. Most of the new flowmeters now use intelligent display instruments and perform automatic density compensation. 3. The principle of electromagnetic flowmeter The electromagnetic flowmeter is based on Faraday's electromagnetic induction theorem. The inner diameter (flow area) of the sensor's pipeline has an influence on the measured value. When the pressure and temperature of the fluid medium are different from the reference conditions, the difference in the flow area causes the meter Changes in readings can be calculated, otherwise a certain error will occur. The instrument has lower requirements for straight pipe sections. Users of pressure transmitters should pay attention to the fact that there is currently no correction formula when the straight pipe section is insufficient. The meter measures the volume flow in the working state. If the volume flow or mass flow in the standard state is required, density compensation is required. 4. Turbine flowmeter is sensitive to on-site conditions, and it is best for users to fully meet its requirements in order to maintain the accuracy of the factory. When the temperature and pressure of the fluid medium are quite different from the reference conditions, the volume change of the sensor housing can be calculated according to the material and temperature and pressure of the sensor, and the meter reading can be corrected. When the viscosity of the fluid medium in the working state is quite different from the viscosity of the calibration fluid, it should be corrected according to the viscosity correction curve provided by the instrument manufacturer. Turbine flowmeters have certain requirements on the length of their upstream and downstream straight pipe sections, which should be met, especially when users require high precision. The meter displays the volume flow under the working conditions of the medium. To know the standard volume flow or mass flow, density compensation is also required.

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